Spark-plug protector



Feb. 24. 1 925.

1,527,170 R. C. CARVER SPARK PLUG PROTECTOR Filed Oct. 10, 1922 INVENTOR.

Patented Feb. 24, 1925.

UNITED STATES RAY o. caavna, or DENVER, COLORADO.

SPARK-PLUG PROTECTOR.

Application filed October 10, 1922. Serial No. 593,585.

To all whom it may concern:

Be it known that I, RAY C. CARVER, a citizen of the United States of America, residin at Denver, in the county of Denver and @tate of Colorado, have invented certain new and useful Improvements in Spark-Plug Protectors, of which the following is a specification.

This invention relates to a device adapted to protect the spark gap of a spark plug from oil, carbon and other foreign substances and also to heat the gas surrounding the spark gap to assist its combustion.

The principal object of the invention is to provide a device of this character which can be readily attached to the present type of spark plugs without necessitating any changes in their construction.

Another object of the invention is to provide a device of this character which allows easy access to the electrodes of the spark plug for cleaning and adjusting.

A further object is to provide a spark plug protector which can be placed upon the present type of spark plugs without it being necessary to disassemble the plug.

A still further object is to provide a device which will maintain a heated area around the spark gap to assist in the ignition of the cylinder gases.

Other objects and advantages reside in the detailed construction of the invention, which result in simplicity, economy, and efiiciency, and which will become more apparent from the following description.

In the following detailed description of the invention reference is had to the accompanying drawing which forms a part hereof, like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing Fig. l is a side elevation of a spark-plug, showing the invention in place.

Fig. 2 is a side elevation of the improved spark-plug protector.

Fig. 3 is a cross-section through my improved spark plug protector taken on the line 33, Fig. 2.

Let the numeral 10 designate a spark plug of the usual construction, consisting of a housing 11, adapted to be screwed into the engine cylinder or combustion chamber,

carrying a bent electrode 12 and threaded to receive a clamp nut 13 for clamping a porcelain insulator 14 thereon. Insulator 14 carries the usual central electrode.

The invention comprises a cylindrical sleeve 34, of the proper diameter to pass within the opening of the spark plug housing 11. Sleeve 34 is open at its upper extremity and closed at its lower extremity by means of a semi-cylindrical end 35. The sleeve is provided with two gas passages 36 and 37 which are placed opposite each other near the lower extremity of the sleeve. Leading from the side of the gas passage 36 is a hook shaped slot 38, and a long vertical slot 39 which connects the gas passage 36 with the open top of the sleeve 34.

To install the protector on a spark plug it is only necessary to force the sleeve 34 within the housing 11, the bent electrode 12 traveling in the longitudinal slot 39. When the sleeve has reached a seat in the housing 11 it is revolved to the left causing the bent electrode to travel and snap into the hookshaped extremity of the slot 38. The sleeve 34 is now firmly locked in place and can not be removed without forcing the bent electrode downward to release it from the slot 38. The sleeve 34 is made of the proper length so that it will seat itself in the housing 11 when the hook-shaped slot 38 is in alignment with the bent electrode 12.

The improved spark plug protector can be applied with equal facility to'spark plugs which have a permanent porcelain as well as to spark plugs which have a removable porcelain.

While I have described and illustrated herein a specific form of my improved invention I wish it understood that the same may be varied within the scope of the ap pended claims without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent is 1. A spark plug protector for attachment to spark plugs of the type having a bent electrode projecting downward and inward from the shell thereof, comprising the combination of a sleeve having a closed end and of the proper diameter to fit within the spark plug shell .and means on said sleeve for engaging said bent electrode for holding said protector in place Within said shell.

2. A spark plug protector comprising a sleeve having, iii-combination, a closed end;

i and an open end; gas openings above said closed end, and a longitudinal slot connecting said gas openings with the open end of said sleeve, and a second lateral slot connecting with one of said gas openings and terminating in an upwardly turned portion for lookingv said slot to the stationary electrode of the spark plug;

In testimony whereof I affix my signature.

, RAY G. CARVER. 

